..either hit a rock or submerged tree in our R- 25 on lake Champlain .seems to be running just fine and all vital readings are normal. Loaded onto the trailer and only damage we could see was very slight bends on two of the three blades of the propeller.no noticeable vibration other than what little there always is.but maybe more since the mind is looking for that!even so,could we be causing more harm without a perfect propeller on a single screw? Any comments appreciated.starr